The simple answer is no – search engine submission isn’t necessary. The majority of search engines nowadays (most notably Google) crawl and index pages by following links. Using that logic, a single inbound link from any already-indexed page will identify your page to the engine. Subsequently, if that page links to other pages within your site, they will also be indexed… and so on.
For this reason, inbound linking is very important. In fact, acquiring back-links may be the most important of SEO. In theory though, a website owner shouldn’t have to ’scout’ or ‘hunt’ for links. If the presented content is of interest, useful, and/or important, there is a natural tendency among web users to link to information. This is the basis for the Google PageRank algorithm.
With all due respect, submitting your site to the search engines can’t hurt. Plus, it only entails about 5 minutes of added work assuming you only submit to the big guys. And once is enough… you don’t need to submit your site more than once. It doesn’t help or get your site crawled any quicker or more often.
The importance of anchor text with respect to a linking strategy cannot be overstated. Back-links are a huge part of the search engine algorithm. When initiating a linking campaign, it is vital that external sites link using the appropriate keywords and terms in the anchor text.
Almost always, linking candidates will use the company name as anchor text. This does not provide any type of description of the target company’s products or services. Sure, it may be great for branding purposes, but it isn’t usually needed. In most cases, companies already rank very high (if not first) for searches that incorporate their brand.